I love brazil nuts as well. I eat several of them every day. I have to reduce the amount to just one/two a day.
Brazil nuts are perhaps the richest dietary source of selenium, with a 28 g (1 oz) serving of 6 nuts supplying 774% DV. This is 10 times the adult U.S. Recommended Dietary Allowance, more even than the Tolerable Upper Intake Level, although the amount of selenium within batches of nuts varies greatly.
The high selenium content is used as a biomarker in studies of selenium intake and deficiency. Consumption of just one Brazil nut per day over 8 weeks was sufficient to restore selenium blood levels and increase HDL (good) cholesterol in obese women.